Add unit tests for config

**Problem**
When working with hooks, the error messages could be more descriptive.

**Suggestion**
Improve error handling and add detailed error messages.

**Context**
This would help with debugging and maintenance.

Start by locating the configuration and hooks code, then find the existing test setup and error-handling paths. Review how hook failures are currently reported and add unit coverage for the relevant cases. Done means the tests cover descriptive error messages and the suite passes.

Written by the indexing model from the issue text.